Added SMTP to acronyms file

Author: eshanrnh

.github/styles/UmbracoDocs/Acronyms.yml

@@ -91,3 +91,4 @@ exceptions:
     - ASCII
     - CMD
     - NGINX
+    - SMTP

umbraco-cloud/expand-your-projects-capabilities/external-services/README.md

@@ -14,7 +14,7 @@ On the **Advanced** page of your project, you can turn on the static outbound IP
 
 {% hint style="info" %}
 
-The enabling of static outbound IP addresses will have the effect that port 25 will be blocked. Port 25 is the default port for Simple Mail Transfer Protocol (SMTP) relays and is commonly abused to send spam from compromised parties. Accordingly, this port is often blocked by ISPs and cloud providers such as Microsoft and Google. For SMTP submissions, we advise you to use port 587 or port 2525.
+The enabling of static outbound IP addresses will have the effect that port 25 will be blocked. Port 25 is the default port for SMTP relays and is commonly abused to send spam from compromised parties. Accordingly, this port is often blocked by ISPs and cloud providers such as Microsoft and Google. For SMTP submissions, we advise you to use port 587 or port 2525.
 
 {% endhint %}